1. Use the diagram below to answer question 91. 1. The diagram models how a poison bonds to the active site of an enzyme. Which function is the enzyme most likely unable to perform because of the attachment of the poison molecule? a. The release of stored chemical energy, b. The donation of electrons to the substrate. c. The supply of activation energy for a reaction. d. The catalysis of the reaction with the substrate.

2. d. The catalysis of the reaction with the substrate

3. Use the graph below to answer question 2. 2. The graph shows how the activity of an enzyme changes at different temperatures. Which statement best describes what happens to the enzyme when the temperature of the reaction reaches 63°C? a. The enzyme is used up and the reaction stops. b. The enzyme begins to decrease the rate of the reaction. c. The enzyme continues to increase the rate of the reaction. d. The enzyme changes shape and can no longer speed up the reaction.

5. 3. Which method regulates enzyme action? a. changing pH b. changing temperature c. a molecule of similar shape to the enzyme competes for the active site. d. All of the above are correct.

7. 4. During enzymatic action, the enzyme a. becomes the product. b. is used up. c. The enzyme and the substrate form a permanent complex. d. The enzyme the substrate form a temporary complex but the enzyme is not used up.

9. 5. Which of the following is NOT an enzyme? a. lipase b. maltase c. urease d. lactose

11. 6. Each enzyme has particular substrate because enzymes a. increase the energy of activation. b. decrease the productivity of the cell. c. always require coenzymes. d. have active sites complementary in shape to their substrates.

13. Use the graph below for question 97. The optimum pH for pepsin is a. 2 b. 8 c. 3 d. 7

14. a. 2

15. 8. Enzymes a. provide the energy for metabolic reactions. b. speed up metabolic reactions. c. act as a buffer in metabolic reactions. d. raise the energy of activation for a reaction.

16. b. speed up metabolic reactions.

17. 9. Describe the relationship between an enzyme, substrate, active site, and product.

18. The enzyme and substrate join, specifically at the active site of the enzyme. When the enzyme and substrate react, they release a product from the enzyme’s active site.

19. 10. Look at the graph below. Explain why enzyme activity increases between 0°C and 20°C.

20. Molecules begin to move faster as temperatures increase, and as molecules move faster, they are more likely to collide so the reaction rate increases.